{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "In this report , we investigate the interaction between thrombin and a thrombin - binding aptamer ( TBA ) on a PEG / TBA coimmobilized surface by using a shear horizontal surface acoustic wave ( SAW ) sensor ."}
{"Chemical": ["PEG"]}